Jonathan d



(No Model.)

.D. MAWHOOD.

FEEDING DEVICE FOR ROLLER MILLS.

Patenjaed Apr. 26, 1887.

Inventor 2mm L Witnesses Attorney- UNITED STATES PATENT OFFICE.

JONATHAN 1). MAwHooD, 'oE EIoHMoND, INDIANA, ASSIGNOR TO THE RICHMONDCITY MILL worms, OF SAME rLAoE.

FEEDING DEVICE FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent No. 362,027 dated April 26,1887.

Application filed February 23,1886. Serial No.192,757. (No model.)

have invented certain new and useful Im-.

provements in Feeding Devices for Roller- Mills, of which the followingis a specification.

My invention pertains to improvements in mechanism for securing a properfloor of material from the hopper or hoppers of the rollermill to therolls thereof, and the same will be readily understood from thefollowing description, taken in connection with the accompanyingdrawings, in which- Figure 1 is a vertical section through one of thehoppers of a double roller-mill, the plane of the section being at rightangles to the axis of the rolls of the mill; Fig. 2, a vertical sectionthrough a portion of the hopper in aplane parallel with the rolls of themill; Fig. 3, a view at the side of the double roller-mill,showing inelevation the two pairs of grinding-rolls and the mechanism by whichmotion is transmitted to the feeding devices; and Fig. 4, an

1 elevation of one face of the hopper with a portion of the wall of thesame broken away in order to exhibit the interior devices.

In the drawings, A indicates the grindingrolls of the mill, of whichthere are of course two pairs in a double roller-mill; B, the usualfeedhopper, disposed above the rolls and arranged to discharge the sheetof material to the grinding-spaces between the rolls of the respectivepairs, Fig. 1 illustrating the por; tion of the hopper, pertinent to onepair of rolls only, the portion pertaining to the other pair of rollsbeing merely the duplicate there of; G, a feed-roll disposed parallel tothe grinding-rolls and above the same, and arranged,as usual, tosubstantially close the contracted base of the hopper; D, a thickboard,secured against the inside of the front wall of the hopper, suchboard reaching from the top of the hopper downward toward the feed-rolland extending horizontally the entire length of the hopper; E, atransverse recess in that surface of the board D which liesagainst thehopperwall, such recess opening downwardly at the lower edge of theboard; F, a gate extending the length of the hopper,and hinged at itsupper edge to the lower edge of the board D, at the inner facethereofiand impinging itslower base of the hopper to be entirely closedwhen the gate thus impinges upon the feed-roll; G, a flat curvedspring,disposed vertically within the recess E, the lower end of thespring bearing inwardly against the gate and tending to brace thegateagainst the feed-roll, a curve in the spring above its lower end bearingagainst the inner face of the hopper-wall, and thereby forming a fulcrumon which the spring might rock; H, an adjusting-bolt engaging the upperend of the spring, and projecting outwardly therefrom through thehopper-wall, such bolt serving in preventing the downward displacementof the spring, and also as a means by which the upper end of the springmay be adjusted toward the hopper-wall J, a tubular rake-shaft supportedin hearings in the end walls of the hopper above the feedroll,and'fitted for reciprocation in such bearings; K, a rake or combsomewhat shorter than the hopper, and secured to the tubular rake-shaftso as to reciprocate therewith, the teeth of the rake projectingdownwardly to near a point where the gate impinges upon the feed-roll;L, a spring consisting of a flexible bar having its upper end secured ina spring-holder attached to the inner surface of the board- D, andhaving its lower end connected with the rake, whereby the spring tendsto resist the endwise n10- tion of the rake-shaft in one direction; M, aface-cam secured to an end of the shaft of the feed-roll, which projectsoutside the hopper, the face of the cam presenting itself to one end ofthe tubular rake-shaft; N, a rod, preferably of wood, disposed withinthe tubular rakeshaft, and having an end projecting beyond the end ofthe rakeshaft into direct contact with the face of the cam; O, aset-screw in the end of the tubular rake-shaft opposite the endpresented to the cam, such set-screw serving to regulate the projectionof the rod beyond the end of the rake-shaft; P, a pulley journaled uponthe outside of one end of the hopper, centrally above and between theoutwardly-projecting shafts of the two feed-rolls of the mill; Q,pulleys upon such projecting ends of the shafts of the feed-rolls, thesepulleys being just outside the cams, previously referred to; R, theusual feed-driving pulley,

edge against the feed-roll, thus causing the secured to the shaft of oneof the grindingrolls; S, a tightening-pulley disposed in the plane ofthe pulleys Q, and to one side of or beyond those pulleys, suchtightening-pulley being supported by any suitable attachment to thehopper or frame of the mill, the pulley being so disposed that a beltpassing from it to the most distant one of the pulleys Q will clear nearthe bottom of theintermediate pulley Q; T, a belt engaging the pulleys Rand P, and provided, preferably, with a tightener, this belt serving intransmitting motion from one of the grinding-rolls to the pulley P; U, apulley connected with and revolved by the pulley P, and of smaller sizethan the pulley P; V, a belt passing from the tighteningpulley S to andpartially around the pulley Q most distant from the tightening-pulley,thence backward and under and partially around the intermediate pulleyQ, thence partially around the pulley, and thence to thetightening-pulley S again; and W, the holder of the spring L, suchholder consisting of a pivoted lever, to which the spring is secured,and provided with a segmental slot, by means of which the lever may beadjusted upon its pivot and then secured, thus putting more or lesstensional flexure upon the spring.

The tension of the spring G tends to keep the gate against thefeed-roll. The pressure of material within the hopper tends to press thegate open so that the sheet-like stream of material may flow downward tothe grindingrolls. The rotation of the feed-rolls serves in urging thesheet of material past the gate. The adj usting-bolt H serves inregulating the tension of the spring, and thereby the resistance againstwhich the gate has to be opened. The curve in the spring forms a fulcrumupon which the spring is strained when the adj usting-bolt is operated.The board D serves in supporting the gate a distance inward from thehopper-wall, and the recess E in the board serves to receive the springand prevent its sidewise displacement.

The rake serves to distribute the material as it passes the openingbetween the gate and feed-roll. The spring L serves to press the rake inone direction toward the cam, while the cam produces the motions of therake in the opposite direction. Theadjustable spring-holder-WV serves inadjusting the tension of the spring L, so as to press the rake towardthe cam with sufficient but not improper force. The rod N serves inpreventing the wear directly upon the end of the rake-shaft, and, if ofwood, serves in securing noiselessness and durability at the point ofcontact with the cam, and the set-screw 0 serves in adjusting theprojection of the rod, in order to compensate for wear upon its end, andin order to permit an adjustment of the relative endwise position of therake within the hopper.

The belt T, engaging the pulleys R and P, serves in transmitting motionto the pulley U; and the belt V, arranged as described, in

connection with its pulleys, serves in transmitting motion from thepulley U to the two feed-rolls, whereby motion, at proper velocities, istransmitted to the two feed-rolls in opposite directions, and by meansof open belts entirely.

I claim as my invention 1. A feed device for a rollermill, comprising ahopper, a feed-roll atthe base thereof, a hinged gate fitted to have itslower edge rest against said roll, a curved flat spring bearing with itsfree end against said gate and resting the convex portion of its curvefulcrum-like against a fixed portion of the hopper, and anadjusting-bolt engaging a fixed portion of the hopper and the fixed endof said spring, substantially as and for the purpose set forth.

2. A feed device for a roller-mill, comprising a hopper, a board, D,secured against the inner wall of the hopper and having a transverserecess, E, a feed-roll at the base of the hopper, a feedgate, F, hingedto the front lower portion of-said board, a spring disposed behind saidfeed-gate and projecting upward into said recess, and an adj usting-boltfor securing and adjusting the spring, substantially as and for thepurpose set forth.

8. A feed device for a roller-mill, comprising a hopper, a feed-roll atthe base thereof, a feed-gate, a rotary shaft carrying a face-cam, areciprocating tubular shaft carrying a rake and presenting its endtoward the face of the cam, a spring arranged to press the rake towardthe cam, a rod disposed within the rakeshaft and projecting endwisetherefrom, and a screw engaging the rake-shaft and rod and serving toadjust the projection of the rod, substantially as and for the purposeset forth.

4. A feed device for a roller-mill, comprising a hopper, feed-roll,feed-gate, reciprocating rake, a cam or equivalent means forreciprocating the rake, a spring-holder pivoted to the hopper andprovided with a slot and bolt by which it may be adjusted upon itspivot,and a spring engaging the spring-holder and rake and adapted to beadjustably fixed by the pivotal adjustment of said springholder,substantially as and for the purpose set forth.

5. In a feed device for a double roller-mill, the combination,substantially as set forth, of two pairs of grindingrolls, afeed-hopper, a feed-roll above each pair of grinding-rolls, pulleys Pand U, disposed over and between the feed-rolls, pulley R upon the shaftof one of the grinding-rolls, belt T, engaging pulleys P and R, pulleysQ upon the shafts of the feed-rolls, pulley S beyond the pulleys Q, andbelt V, engaging in order the pulleys S, Q Q, and U.

In testimony whereof I affiX my signature in presence of two witnesses.

V JONATHAN D. MA\VHOOD. \Vitnesses:

J AS. W. NIoHoLs, W. T. DENNIS.

